“It will go hard with Mr. Noname if he is caught now,” said Frank.

“It should!” hissed Diamond. “The man is a maniac! I have felt it all along! I have feared him!”

Diamond was eager to capture the Mystery, but, when the room was reached from which the bomb had been thrown, all they found was a quiet-looking, smooth-faced man, who was seated at a table, drinking coffee, and looking over a morning paper. The officers demanded of Frank and Jack if that were the man. They seemed disappointed when both lads declared it was not. Then they questioned the man, who seemed greatly surprised. Had he seen another person in the room? He had. A man had entered a short time before, but he had not noticed him in particular, as he was sitting with his back toward the window. The man had just left the room in a hurried manner. Whither did he go? The door by which he had departed was pointed out.

The officers were eager to capture the bomb-thrower. It would be greatly to their credit. They hastened from the room by the door. Frank and Jack followed. Barely were they out of the room when Frank stopped.

“This is mighty queer,” he said.

“What?” asked the Virginian.

“That the man in there knows nothing of the bomb-throwing.”

“That’s right.”

“I believe he knows more than he has told.”

“You may be right.”